Volt - Volt is a reactive web framework where Ruby code runs both on the server and the client (via opal).
Meludia - Listening exercises and to sharpen your ear and music theory skills
Grid50 - The Marketplace for Photographers & Videographers
GNU Solfege - GNU Solfege is free music education software.
KitSplit - Airbnb for creative equipment - rent cameras, drones & more
Perfect Ear - A simple yet advanced application for improving your solfege skills.